Cross-thread-laying mechanism for sewing-machines



J. R. MOFFATT.

CROSS THREAD LAYING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV-15,19l6.

1,327,348. Patented Jan. 6, 1920.

5 SHEETS-SHEET I.

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CROSS THREAD LAYING MECHANISM FOR SEWING MACHINES.

Patented Jan. 6, 1920.

APPLICATION FILED NOV. I5, I9I6- 5 SHEETSSHEET 2.

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APPLiCAHON FILED NOV. 15. mm.

Patented Jan. 6, 1920.

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1. R. MOFFATT.

CROSSTHREAD LAYING MECHANISM FOR SEWING MACHINES.

APPLICAHON HLED Nov. 15. l9l6.

1,327,348. Patented Jan.6,1920.

5 SHEETS-SHEET 4.

J. R. MOFFATT. CROSS THREAD LAYING MECHANESM FOR SEWING MACHINES. APPLICAHQN FILED NOV. 15. 1916.

1 .327 348 Patented Jan. 6, 1920.

5 SHEETS-SHEET 5.

IINITEE TATE PATENT @FFIQE.

JAMES R. MOFFATT, OF CHICAGO, ILLINOIS, AfSSIGNOR TO-UNION SPECIAL MACHINE COMPANY, or

CHICAGO, ILLINOIS, A-CORPORATION OF ILLINOIS.

Specification of Letters Patent.

PatentedJan. o, 1920.

Application filed November 15, 1916. Serial No 131,486.

To all whom it may concern:

Be it known that I, J AMES R. MorrA'rr, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Cross-Thread-Laying li Iechanism for Sewing-h/Iachines, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in cross thread laying mechanisms for sewing machines, and more particularly to a cross thread laying mecha nism which lays a thread back and forth across the line of feed so as to join the loops formed in a plurality of needle threads.

An object of the invention is to provide a cross thread laying mechanism wherein an oscillating hook cooperates with a fixed thread guide, said hook being mounted at the opposite side of the needles from said thread guide and moving across the line of feed to engage the thread passing through the thread guide and forming a loop in said thread which is positioned so that the needle farthest removed from the stationary thread guide enters said loop.

Another object of the invention is to provide a cross thread laying mechanism of the above character wherein both the thread hook and the fixed thread guide are mounted so as to move up and down with the presser foot.

A further object of the invention is to provide a cross thread laying mechanism of the above character which moves up and down with the presser foot with means for oscillating the thread hook, which means is so disposed that the up and down movements of the presser foot do not affect the position of the thread hook.

A still further object of the invention is to provide a machine having a cross thread laying mechanism which moves up and down with the presser foot as the thickness of the material varies, with a ruffiing mechanism which includes a rufiier blade acting on material in front of the cross thread laying mechanism, which rufflingblade is controlled by the presser bar so as to move up and down withthe presser foot for varying thicknesses of material and for inserting the material.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings, which show by way of I illustration one embodiment of the inven- Figure 1 is a front View of a sewing machine embodying my improvements :Wlbll parts broken'away to disclose the looper;

F g. 2 1s a rear view of the same;

F g. '3 is an end View of the same;

' Fig. 4k is a detail showing in plan the presser foot, the stationary thread guide, the thread hook, and the means for operating the thread hook, said thread hook being positioned for engagement with the thread passing through the thread guide;

Fig. 5 is a similar view, but showing the thread hook in position'for forming a loop in the cross thread for the entrance of the needle farthest removed from the thread guide;

Fig. 6 is a detail in vertical section showing the relation of the needle, the cross thread laying mechanism, the feed, the looper, the presser foot, and a milder which may be used in connection with the machine;

Fig. 7 is a View, showing, more or less diagrammatically, the needle threads, the needles, the cross thread, the stationary thread guide and the thread hook just as said thread hook is moving into engagement with the cross thread; and I Fig. 8 is a similar View, but showing the hook as moved to the opposite side of the needles and positioning the loop formed in the cross thread for the entrance of the needle.

The invention is embodied in a sewing machine having a plurality of needles (preferably two) which are arranged in a line substantially at right angles to the line of feed, and a single looper cooperates with the needles beneath the work support. The material is heldon the work support by a presser foot, and mounted to move up and J00 moved from the stationary thread guide.-

This thread hook is carried by a rock arm which is pivoted to the shank of the presser foot, and the rock armis in turn actuated by a. lever pivoted on the shank of the presser foot through a link connection therewith. The lever is operated by a suitable mechanism which permits the presser foot to raise and lower with the varying thicknesses of the material operated upon without disturbing the position of the thread hook.

Located in front of the cross thread laying mechanism is a rufiiing mechanism which includes a rufHing blade engaging the fabric in front of the stitching mechanism. This rufliing blade is carried by a bar or support which is connected to the presser bar so as to move up and down with the presser foot as the thickness of the material varies.

Referring more in detail to the drawings:

My invention is embodied in a sewing machine having a supporting base 1 which carries a standard 2 having an overhanging arm 3. Mounted on the supporting base is a work support 4. A needle bar 5 reciprocates in the free end of the overhanging arm 3 and, as herein shown, said needle bar is provided with two needles 6 and 7. Cooperating with the needles below the work support is a looper 8 which is mounted on a looper carrier 9, and this looper carrier is oscillated by a suitable link 10 connected to the needle lever extension 11. The needle bar 5 is reciprocated by a needle lever 12, which carries this needle lever extension, and-this needle lever is connected by a link 18 to the needle bar. The needle lever is pivoted at 14- and is oscillated by an eccentric strap 15 which cooperates with an eccentric on the main shaft 16.

The material is held on the work support by a presser foot 17. This presser foot is carried by a presser bar 18 which is mounted in suitable hearings in the overhanging arm. A guide bar '19 also reciprocates in suitable bearings in the overhanging arm, and this guide bar is connected to an arm 20 secured to the presser bar, and the guide bar serves as a means to prevent the presser bar from oscillating in its bearings. Cooperating with this presser foot 17 is a feed dog 21 which is carried by a feed bar 22, and this feed bar is moved back and forth by a feed rocker 23 to which it is pivoted, and the feed rocker is oscillated by suitable devices connected to the. forward end of the main shaft 16. The feed bar 22 is raised and lowered by an eccentric 24 on the main shaft 16..

My improved cross thread laying mechanism includes a fixed thread guide and an oscillating thread hook. The fixed thread guide is disposed at one side of the needles and slightly in rear of the plane of the needles which are arranged at right angles to the line of feed. The thread hook has a rearwardly bent end whereby said member v may move across the line offeed to engage the cross thread extending through said fixed guide and draw said cross thread back across the line of feed in loop form so that said cross thread hook will be disposed wholly at one side of the line of feed and holding the thread hook for the needles. This fixed thread guide is in the form of an arm 25 having the thread eye 26 extending therethrough. The arm 25 is clamped in a lu 27 by a set screw 28. This lug is carried by a bracket 20 mounted on the presser bar so that said lug and the thread guide move up and down with the presser foot, and said thread guiding eye will therefore have a fixed relation to the presser foot. Th thread hook is in the form of a bent arm 29 having a rearwardly bent hook 30 at the free end thereof. The arm 29 is integral with a supporting shank 31 which extends upwardly and is clamped in a sleeve This sleeve is mounted to oscillate freely in bearings 33 and 34L formed in the bracket carried by the presser bar. Said bearings 33 and 34: are spaced and a collar 35 located between the bearings is attached to the sleeve 32. This collar has an outwardly projecting arm 36 to which the link 37 is pivoted, as at 38. The bracket is recessed as at 39, and mounted in this recess is a lever 40 which is pivoted at 41 to the bracket. The lever extends through the recess and is pivoted at 42 to the link 87. Said lever 40 has an upwardly projecting stud 4L3 provided with a ball 44. A link 45 engages this ball and serves as a means for oscillating the lever. Said link 45 at its other end is connected to a ball stud 46 which is clamped to the lower end of an arm d7. The arm 47 is formed integral with a collar 48 which is clamped to the shaft 49.

This shaft 49 is mounted in bearings 50 and 51 carried by the overhanging arm. The shaft a9 has a second collar 52 which carries a rearwardly projecting arm 53. eccentric strap 5% cooperating with an eccentric on the main shaft 16 is pivotally connected at its upper end at 55 to the arm 53. As the main shaft rotates the cross shaft d9 will be oscillated, and this cross shaft through the arm 4:7 and link &5 will oscillate the lever 40. The link 40 in turn through the link 37 oscillates the supporting sleeve 32 for the thread hook 29.

It will be noted from Figs. 4, 5, 7 and 8 that the thread hook 29 is mounted so as to move from a position at one side of the needles to the opposite side thereof, and when said thread hook is in a position adjacent the fixed thread guide it will be moved into engagement with the thread passing through the thread guide. Asthe hook moves backwardly across the line of feed it will carry the cross thread with it, forming a loop in the cross thread. This thread hook and thestationary thread guide are so positioned relative to the needles and the line of feed that when said thread hook has reached its extreme movement away from the fixed thread guide, the thread loop carried thereby will be positioned so that the strand of the loop extending from the hook to the thread guide extends between the needles 6 and 7 This is clearly shown in Fig. 8 of the drawings. In this figure of the drawings, the cross thread is inclicated at C, the thread of the needle 6 at a, while the thread of the needle 7 is indicated at n. The strand 0 of the cross thread is the strand of the loop between the hook and the stationary thread guide, and this strand lies between the needles which are moving downwardly to enter the fabric. The other strand of the loop formed in the cross thread extending from the hook to the previous locking of the cross threads with the needle loops lies entirely in rear of the needles so that the needle farthest removed from the stationary thread guide alone enters the loop formed in the cross thread.

As above noted, the stationary thread guide and the thread hook, together with the immediate mechanism for operating the thread hook, are carried by a bracket on the presser bar so that as the presser foot moves up and down, these parts will move up and down with the same. The are through which the end of the link moves is relatively small and substantially vertical, and therefore the up and down movements of the presser foot will not shift the lever 40 or affect the position of the thread hook.

My improved machine is especially adapted to be used in connection with a rufliing mechanism operating upon the fabric in advance of the needles, and in the drawings I have shown one form of ruffling mechanism which consists of a ruffiing blade 56 which is pivoted at 57 to a supporting bar 58. The rattling blade is yieldingly forced toward the .work support and the downward movement thereof is limited by an arm 59 which moves back and forth with the ruffling blade and which bears on the upper face of the presser foot. The supporting bar 58 is pivoted at 60 to a bracket 61 which is mounted on a collar by a supporting block 62 clamped to the upper end of the presser bar 18. A sleeve 63 slides freely on the supportingbar 58, and this sleeve 63 is pivoted at 64 to a block 65 fixed to theneedle bar and movable up and down with the needle bar; The up and down movements of this block 65 through the sleeve 63 causesthebar which supports the ruffler to oscillate back and forth. This rufiling mechanism per 86 forms no part of the present invention, but. is shown, 7 ing application, Serial No. 134,658, filed December 2, 1916.

It is obvious tails of construction and the arrangement of described and claimed in my copendthat minor changes in the de-.

of feed to engage the cross thread extending through saidfixed guide and draw said cross thread back across the line of feed in loop form, said cross thread loop forming member being disposed wholly at one side of the line of feed when holding the cross thread loop for the needles and said hook being so disposed relative to the fixed thread guide as to position the loop in the cross thread for the entrance of the needle farthest from the thread guide.

2. The combination of a work support, a

presser foot, a presser bar carrying said foot, a feeding mechanism, a pair of needles arranged in a plane at right angles to the line of feed, a fixed thread guide carried by the presser foot and disposed at one side of the needles and slightly in rear of the plane of the needles, a thread hook carried by the presser bar and movable across the line of feed to engage a cross thread extending through said fixed thread guide and back across the line of feed for forming a loop in the cross thread, said hook and stationary thread guide being so disposed relative to theneedles as to position the loop in the cross thread for the entrance only of the needle farthest removed from the thread guide.

3. The combination of a work support, a presser foot, a presser bar carrying the same, a. feeding mechanism,a pair of needles arranged in a line at right angles to the line of feed, a fixed thread guide carried by the presser bar and located at one side of the needles and in a plane in rear of the needles, a vertical sleeve mounted in bearings carried by the presser bar, a thread hook secured to said sleeve, a lever pivotally carried by said presser bar, an arm carried b said sleeve a link connectin the arm to" said lever, and means for oscillating said lever, said means for oscillating the lever beingso constructed and disposed as to permit the presser foot to raise andlower without striking the thread hook.

4:. The combination of a work support, an overhanging arm, a shaft carried by the overhanging arm, a main shaft, means for oscillating the'shaft on the overhanging arm from the main shaft, feeding mechanism, a presser bar, a'presser foot carried by said presser bar, a plurality of needles arranged in a line at right angles to the line of feed, a fixed thread guide carried by the presser bar and located at one side of the needles and in a plane in rear of the needles, a thread hook mounted on the presser bar and swinging about a vertical axis, a lever mounted on the presser bar, means connecting the lever to the thread hook, and means for Connecting the lever to the shaft on the overhanging arm.

5. The combination of a Work support, an overhanging arm, a shaft carried by the overhanging arm, a main shaft, means for oscillating the shaft on the overhanging arm from the main shaft, feeding mechanism, a

presser bar, a presser foot carried by said presser bar, a plurality of needles arranged in a line at right angles to the line of feed, a fixed thread guide carried by the presser bar and located at one side of the needles and in a plane in rear of the needles, a thread hook carried by the presser bar and swinging about a vertical axis, a lever mounted on the presser bar, means connecting the lever to the thread hook, an arm depending from said shaft on the overhanging arm, and a link for connecting said lever to said arm.

6. The combination of a Work support, a presser foot, a presser bar supporting said presser foot, feeding mechanism, a plurality of needles arranged in a plane at right angles to the line of feed, a cross thread laying mechanism cooperating With said needles, said cross thread laying mechanism being supported so as to move up and doWn with the presser foot, and a rufliing mechanism including a rufiling blade engaging the material in front of the needles, a support for the rufl'ling blade, said support being carried by the presser bar so that the ruflling blade moves up and down with the p'resser foot, and means for actuating the ruffiing blade.

In testimony whereof, I affix my signature, in the presence of a Witness.

JAMES R. h/IOFFATT. Witness: S. GEORGE TATE. 

